Size: 27*17cm package contains single armrest accessories high quality steel: - the child safety bike baby handle is made of high quality steel, strong and durable for long term use. Exquisite workmanship, not easy to fade and damage. You can use and buy it with confidence. Universal Size: - Bike rear seat handle length about 18CM, folded length about 12cm, height about 18cm. Suitable for seat tubes from 25.4 to 31.8 mm in diameter. Can be used on most standard bike frames up to a maximum weight of 20 kg.non-slip grips: - the safety bike rear seat armrests for the rear seat of the bike are designed with anti-slip details and texture special. Strong adhesion, prevent slipping and ensure safety. It is perfect for children and will bring the best riding experience for you and your children. Easy to Use: - The child safety bike rear seat armrests are easy to install and remove without disassembling the seat. The four-hole clamp screws fix the iron plate, firmly fixing the bike armrest to the frame. It can be used on a standard bike rack and is common to most bikes. The exquisite black look can make your bike look more beautiful. widely used: - the screw can effectively adjust the size of the gauge, and is suitable for installing all kinds of bicycles, such as hybrid bicycles, passenger cars, bicycles. ordinary bicycles, off-road vehicles, electric vehicles, road bicycles, etc.